Google Image Search Can't Find Images From Before April 2008

So apparently if you try to filter out images in Google Image search to show images from April 2008 or earlier, Google will tell you that you are out of luck. If you change it to May 2008, sure, but something about April 2008 or earlier, Google Image search cannot help you out. I am not sure why exactly?

Danny Sullivan from Google said on Twitter said he will pass it along but he guessed "images from that time period probably don't have embedded meta data with the dates and are on pages published since the web began, which means assumed dates of 1993 onward."

I'll pass it on, but my guess is because image dates are hard. Images from that time period probably don't have embedded meta data with the dates and are on pages published since the web began, which means assumed dates of 1993 onward.